CN113328516A - Topology signal sending circuit based on capacitance switching and identification method - Google Patents

Topology signal sending circuit based on capacitance switching and identification method Download PDF

Info

Publication number
CN113328516A
CN113328516A CN202110453491.5A CN202110453491A CN113328516A CN 113328516 A CN113328516 A CN 113328516A CN 202110453491 A CN202110453491 A CN 202110453491A CN 113328516 A CN113328516 A CN 113328516A
Authority
CN
China
Prior art keywords
module
capacitor
signal
topology
current signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110453491.5A
Other languages
Chinese (zh)
Other versions
CN113328516B (en
Inventor
王朝亮
李熊
陆春光
肖涛
葛玉磊
李亦龙
李宏硕
臧人霖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Topscomm Communication Co Ltd
Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
Qingdao Topscomm Communication Co Ltd
Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Topscomm Communication Co Ltd, Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd filed Critical Qingdao Topscomm Communication Co Ltd
Priority to CN202110453491.5A priority Critical patent/CN113328516B/en
Publication of CN113328516A publication Critical patent/CN113328516A/en
Application granted granted Critical
Publication of CN113328516B publication Critical patent/CN113328516B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The invention discloses a topology signal sending circuit based on capacitance switching and an identification method, and belongs to the technical field of distribution room topology identification. The invention discloses a topology signal sending circuit based on capacitance switching, which comprises a PWM signal module, a high-voltage MOS tube module, a switch module and a capacitance group module; the PWM signal module is used for generating a PWM signal; the high-voltage MOS tube module is used for controlling the capacitor bank module to generate an alternating current signal; the switch module is used for controlling the capacitor bank module to be connected to a power supply circuit; the capacitance bank module is used for forming a current signal on the power network. According to the invention, the on-off of the capacitor bank module is controlled by the high-voltage MOS tube module, and charging and discharging are carried out according to a set frequency by utilizing the capacitive reactance characteristic of the capacitor, so that a characteristic current signal for topology identification is formed on a power network. The method and the device can safely and accurately generate the topology signals, effectively reduce the potential safety hazard of the power line, and further realize accurate identification of the topology of the transformer area.

Description

Topology signal sending circuit based on capacitance switching and identification method
Technical Field
The invention relates to a topology signal sending circuit based on capacitance switching and an identification method, and belongs to the technical field of distribution room topology identification.
Background
The distribution room topology refers to the multi-stage attribution relationship among the electric meters, the meter boxes, the branch boxes, the outgoing lines and the transformers in the distribution room. The topological relation of the transformer area is widely applied to power grid services such as power grid marketing, power distribution service and the like, and is an important basis for developing fault diagnosis, sectional line loss calculation, electricity larceny prevention and reactive power optimization. However, in domestic power grids, especially in low-voltage distribution areas, power supply modes are complex and various, a plurality of nonstandard power supply situations exist, power grid lines are transformed along with continuous upgrading of a power distribution network, old or fault power meters also need to be replaced frequently, topological relations in the distribution areas are changed frequently due to various reasons, and the distribution areas are difficult to comb. The platform area topological relation is not clear, the deepening development of the power grid business is caused, and great difficulty is caused to the further development of power grid marketing and power distribution service.
Further, the existing scheme usually generates a topology signal by using a distortion current and voltage mode, but the scheme may cause potential safety hazard to a power line, and a specific topology structure is not set forth, so that a current characteristic current signal cannot be accurately generated, and accurate identification of a station area topology is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a topology signal transmitting circuit based on capacitor switching and an identification method, wherein the high-voltage MOS tube module is used for controlling the on-off of a capacitor bank module, the capacitive reactance characteristic of a capacitor is utilized, charging and discharging are carried out according to a set frequency, a characteristic current signal for topology identification is formed on a power network, a topology signal can be generated safely and accurately, the potential safety hazard of a power line is effectively reduced, and the accurate identification of the topology of a transformer area is further realized.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a topological signal transmitting circuit based on capacitance switching,
the device comprises a PWM signal module, a high-voltage MOS tube module, a switch module and a capacitor bank module;
the PWM signal module is used for generating a PWM signal and acting on a grid electrode of the high-voltage MOS tube module;
the high-voltage MOS tube module is used for controlling the capacitor bank module to generate an alternating current signal;
the switch module is used for controlling the capacitor bank module to be connected to a power supply circuit;
the capacitance bank module is used for forming a current signal on a power network;
when the switch module is closed, the capacitor bank module is precharged through the power circuit;
the PWM signal module generates a PWM modulation waveform to drive a grid electrode of the high-voltage MOS tube module;
the capacitor bank module is used for charging and discharging according to the set frequency by utilizing the capacitive reactance characteristic of the capacitor according to the on-off condition of the high-voltage MOS tube module, and forming an alternating current signal, namely a characteristic current signal for topology identification on a power network.
Through continuous exploration and test, a PWM signal module, a high-voltage MOS tube module and a capacitor bank module are arranged; the high-voltage MOS tube module is used for controlling the on-off of the capacitor bank module, and charging and discharging are carried out according to the set frequency by utilizing the capacitive reactance characteristic of the capacitor, so that an alternating current signal, namely a characteristic current signal for topology identification is formed on a power network.
Furthermore, the method and the device can safely and accurately generate the topology signals, effectively reduce the potential safety hazard of the power line, further realize accurate identification of the platform area topology, and have simple scheme and easy realization.
As a preferable technical measure:
the capacitor bank module comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6, which are respectively connected with a live wire;
the capacitance values of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 determine the signal strength of the characteristic current.
As a preferable technical measure:
the signal intensity calculation formula of the characteristic current is as follows:
I＝K*V/ZC＝K*V/(2*Pi*F*C)
wherein, K is the average value coefficient of the full-bridge rectification, V is the power voltage, F is the power frequency, and C is the capacitance value of the capacitor.
As a preferable technical measure:
the capacitor bank module is connected with a lower full-bridge rectification module;
the full-bridge rectification module is used for rectifying current into half-wave high-voltage direct current and comprises a diode VD1, a diode VD2, a diode VD3 and a diode VD 4.
As a preferable technical measure:
the full-bridge rectification module is connected with a driving voltage module for providing stable voltage;
the driving voltage module comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a reverse diode VD5, a diode VD6, a diode VD7 and a diode VD 8.
As a preferable technical measure:
the driving voltage module is connected with a pre-charging module;
the pre-charging module is used for controlling the pre-charging of the capacitor bank module and comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a MOS transistor VT1 and a capacitor C7;
when the capacitor C7 is fully charged, the MOS transistor VT1 is turned off, and the capacitor bank module stops charging; the pre-charging can reduce the pressure of the power line and reduce the loss of the line.
As a preferable technical measure:
the high-voltage MOS tube module is provided with an MOS tube VT2 and is used for receiving PWM signals, so that the capacitor bank module can act on a power network according to the on-off condition of the high-voltage MOS tube module, and special current signals are formed on a power line according to the capacitive reactance characteristic of the capacitor.
A topological signal identification method based on capacitance switching,
by applying the topological signal transmitting circuit based on the capacitance switching,
which comprises the following steps:
firstly, a capacitor bank module is connected to a live wire through a switch module;
secondly, the PWM modulation waveform of the PWM signal acts on the grid electrode of the high-voltage MOS tube module;
thirdly, the high-voltage MOS tube module controls the capacitor bank module to continuously charge and discharge according to the change rule of the grid voltage of the high-voltage MOS tube module;
fourthly, the charging and discharging signals form an alternating current signal which changes according to a set frequency on the power network and is used as a characteristic current signal for topology identification;
fifthly, transmitting the characteristic current signal to a receiving terminal at the upper stage through a power network, and confirming the subordination relation between the transmitting terminal and the receiving terminal after the receiving terminal recognizes the characteristic current signal;
and sixthly, determining the topological relation of the whole platform area through the subordination relation of each hierarchy.
The invention carries out topology identification according to the characteristic current signal generated by the topology signal transmitting circuit, and the scheme is detailed, practical and feasible and is easy to realize.
As a preferable technical measure:
the switching frequency of the PWM signal is fHz, the switch is turned on for t microseconds and turned off for t microseconds in each switching period, and the duty ratio is 1/2;
and (4) coding the characteristic current signal, wherein T milliseconds are taken as one code bit, the switch is periodically switched on and off for T milliseconds to represent the code bit 1, the switch is continuously switched off for T milliseconds to represent the code bit 0, and the code element of the characteristic current signal is fixed to [ 11111001 ].
The topology signal sending circuit generates a corresponding characteristic current signal and sends the characteristic current signal according to the issued time scale; the characteristic current signal is transmitted to a receiving end of the previous stage through a power network, and the receiving end carries out real-time sampling identification on the current signal and stores an identification record; and finally combing the topological structure according to the identification record and by combining a table searching mechanism to obtain the topological relation of the station area.
Preferably, f is 625, T is 800 and T is 800.
Namely, the switching frequency of the PWM signal is 625Hz, the switch is switched on for 800 microseconds and switched off for 800 microseconds in each switching period, and the duty ratio is 1/2; in order to accurately extract the energy of the characteristic current signal, the characteristic current signal is coded, 500 switching periods (800 milliseconds) are used as one code bit, 800 milliseconds are used for periodically switching on and off a switch to represent code bit 1, and 800 milliseconds are used for continuously switching off the switch to represent code bit 0.
As a preferable technical measure:
the receiving end utilizes Fourier transform to identify the line current, and the Fourier transform identification formula is as follows:
Figure BDA0003039713040000041
Figure BDA0003039713040000042
Figure BDA0003039713040000043
wherein ,an,bn,cnRespectively representing frequency points fnThe real part, the imaginary part and the modulus of the harmonic wave, theta is the current phase, T is the number of points adopted in a sliding period, and T0To represent the starting sample point, k represents the sample point number, dt represents the sample time interval,
Figure BDA0003039713040000044
are current samples.
Compared with the prior art, the invention has the following beneficial effects:
through continuous exploration and test, a PWM signal module, a high-voltage MOS tube module and a capacitor bank module are arranged; the high-voltage MOS tube module is used for controlling the on-off of the capacitor bank module, and charging and discharging are carried out according to the set frequency by utilizing the capacitive reactance characteristic of the capacitor, so that an alternating current signal, namely a characteristic current signal for topology identification is formed on a power network.
The method and the device can safely and accurately generate the topological signal, effectively reduce the potential safety hazard of the power line, further realize accurate identification of the platform area topology, and have simple scheme and easy realization.
Drawings
Fig. 1 is a schematic diagram of a topology signaling circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
As shown in fig. 1, a topology signal transmitting circuit based on capacitance switching includes a PWM signal module, a high voltage MOS transistor module, a switch module, and a capacitance group module;
the PWM signal module is used for generating a PWM signal and acting on a grid electrode of the high-voltage MOS tube module;
the high-voltage MOS tube module is used for controlling the capacitor bank module to generate an alternating current signal;
the switch module is a relay and is used for controlling the capacitor bank module to be connected to a power circuit;
the capacitance bank module is used for forming a current signal on a power network;
when the switch module is closed, the capacitor bank module is precharged through the power circuit;
the PWM signal module generates a PWM modulation waveform to drive a grid electrode of the high-voltage MOS tube module;
the capacitor bank module is used for charging and discharging according to the set frequency by utilizing the capacitive reactance characteristic of the capacitor according to the on-off condition of the high-voltage MOS tube module, and forming an alternating current signal, namely a characteristic current signal for topology identification on a power network.
Through continuous exploration and test, a PWM signal module, a high-voltage MOS tube module and a capacitor bank module are arranged; the high-voltage MOS tube module is used for controlling the on-off of the capacitor bank module, and charging and discharging are carried out according to the set frequency by utilizing the capacitive reactance characteristic of the capacitor, so that an alternating current signal, namely a characteristic current signal for topology identification is formed on a power network.
The method and the device can safely and accurately generate the topological signal, effectively reduce the potential safety hazard of the power line, further realize accurate identification of the platform area topology, and have simple scheme and easy realization.
A specific embodiment of the capacitor bank module of the present invention:
the capacitor bank module comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6, which are respectively connected with a live wire;
the capacitance values of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 determine the signal strength of the characteristic current.
The signal intensity calculation formula of the characteristic current is as follows:
I＝K*V/ZC＝K*V/(2*Pi*F*C)
wherein, K is the average value coefficient of the full-bridge rectification, V is the power voltage, F is the power frequency, and C is the capacitance value of the capacitor.
The invention discloses a specific embodiment of a full-bridge rectification module, which comprises the following steps:
the capacitor bank module is connected with a lower full-bridge rectification module;
the full-bridge rectification module is used for rectifying current into half-wave high-voltage direct current and comprises a diode VD1, a diode VD2, a diode VD3 and a diode VD 4.
A specific embodiment of the driving voltage module of the present invention:
the full-bridge rectification module is connected with a driving voltage module for providing stable voltage;
the driving voltage module comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a reverse diode VD5, a diode VD6, a diode VD7 and a diode VD 8.
One embodiment of the pre-charge module of the present invention:
the driving voltage module is connected with a pre-charging module;
the pre-charging module is used for controlling the pre-charging of the capacitor bank module and comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a MOS transistor VT1 and a capacitor C7;
when the capacitor C7 is fully charged, the MOS transistor VT1 is turned off, and the capacitor bank module stops charging; the pre-charging can reduce the pressure of the power line and reduce the loss of the line.
The invention relates to a specific embodiment of a high-voltage MOS transistor module, which comprises the following steps:
the high-voltage MOS tube module is provided with an MOS tube VT2 and is used for receiving PWM signals, so that the capacitor bank module can act on a power network according to the on-off condition of the high-voltage MOS tube module, and special current signals are formed on a power line according to the capacitive reactance characteristic of the capacitor.
As shown in fig. 1, a preferred embodiment of the transmitting circuit of the present invention:
the invention adopts the relay and the PWM dual-drive mode to control the capacitor bank module, and has higher safety by adopting the relay control because the current intensity of capacitor switching is higher.
When the device is ready to send a characteristic current signal, the system closes the relay by controlling a relay control switch RELAY 1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6 in a capacitor bank module are connected to a live wire, and after the current passes through the capacitor bank module, the current is rectified by a full bridge of a diode VD1, a diode VD2, a diode VD3 and a diode VD4 to form a half-wave high-voltage direct current; the capacitor C8 is a safety capacitor, and the circuit safety is improved.
Then, after the high-voltage direct current passes through the resistor R5, the resistor R6, the resistor R7, the resistor R8, the reverse diode VD5, the diode VD6, the diode VD7 and the diode VD8, a stable gate driving voltage is supplied to the MOS transistor VT1 through the resistor R9, so that the capacitor bank module is precharged through the resistor R1, the resistor R2, the resistor R3, the resistor R4, the MOS transistor VT1 and the capacitor C7. When the capacitor C7 is fully charged, the MOS transistor VT1 is turned off, and the capacitor bank stops charging; the pre-charging can reduce the pressure of the power line and reduce the loss of the line.
Furthermore, the PWM drive directly acts on the MOS transistor VT2 of the high-voltage MOS transistor module, the capacitor bank module directly acts on the power network according to the on-off condition of the high-voltage MOS transistor module, and a special current signal is formed on the power line according to the capacitive reactance characteristic of the capacitor.
The capacitance values of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 in the capacitor bank module determine the signal strength of the characteristic current, and according to the capacitive reactance characteristic of the capacitor, the calculation formula of the signal strength is as follows:
I＝K*V/ZC＝K*V/(2*Pi*F*C)
＝0.89*220*2*Pi*f*C
＝0.89*220*2*3.14*50*C
＝60000C
when the capacitance C is 1uF, I60000 0.000001 0.06A 60mA
It follows that a maximum of 60mA can be obtained in a 50H, 220V grid for every 1uF capacitance. The specific current intensity is determined according to the actual line condition of the station area.
The invention applies an embodiment of a topological signal transmitting circuit based on capacitance switching:
a topological signal identification method based on capacitance switching comprises the following steps:
firstly, a capacitor bank module is connected to a live wire through a switch module;
secondly, the PWM modulation waveform of the PWM signal acts on the grid electrode of the high-voltage MOS tube module;
thirdly, the high-voltage MOS tube module controls the capacitor bank module to continuously charge and discharge according to the change rule of the grid voltage of the high-voltage MOS tube module;
fourthly, the charging and discharging signals form an alternating current signal which changes according to a set frequency on the power network and is used as a characteristic current signal for topology identification;
fifthly, transmitting the characteristic current signal to a receiving terminal at the upper stage through a power network, and confirming the subordination relation between the transmitting terminal and the receiving terminal after the receiving terminal recognizes the characteristic current signal;
and sixthly, determining the topological relation of the whole platform area through the subordination relation of each hierarchy.
The invention discloses a best embodiment of a topological signal identification method, which comprises the following steps:
the frequency of a capacitor switching switch is 625Hz, the switch is switched on for 800 microseconds and switched off for 800 microseconds in each switching period, and the duty ratio is 1/2; in order to accurately extract the energy of the characteristic current signal, the characteristic current signal is coded, 500 switching periods (800 milliseconds) are used as one code bit, 800 milliseconds of switch periodic on-off represent the code bit 1, 800 milliseconds of switch continuous off represent the code bit 0, and the code element of the characteristic current signal is fixed to [ 11111001 ].
The topology signal sending circuit generates a corresponding characteristic current signal and sends the characteristic current signal according to the issued time scale; the characteristic current signal is transmitted to a receiving end of the previous stage through a power network, and the receiving end carries out real-time sampling identification on the current signal and stores an identification record; and finally, combing the topological structure according to the identification record and by combining a table searching mechanism to obtain the topological relation of the distribution area, wherein the scheme is detailed and feasible.
The receiving end utilizes Fourier transform to identify the line current, and the Fourier transform identification formula is as follows:
Figure BDA0003039713040000071
Figure BDA0003039713040000072
Figure BDA0003039713040000073
wherein ,an,bn,cnRespectively representing frequency points fnThe real part, the imaginary part and the modulus of the harmonic wave, theta is the current phase, T is the number of points adopted in a sliding period, and T0To represent the starting sample point, k represents the sample point number, dt represents the sample time interval,
Figure BDA0003039713040000074
are current samples.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (10)

1. A topological signal transmission circuit based on capacitance switching is characterized in that,
the device comprises a PWM signal module, a high-voltage MOS tube module, a switch module and a capacitor bank module;
the PWM signal module is used for generating a PWM signal and acting on a grid electrode of the high-voltage MOS tube module;
the high-voltage MOS tube module is used for controlling the capacitor bank module to generate an alternating current signal;
the switch module is used for controlling the capacitor bank module to be connected to a power supply circuit;
the capacitance bank module is used for forming a current signal on a power network;
when the switch module is closed, the capacitor bank module is precharged through the power circuit;
the PWM signal module generates a PWM modulation waveform to drive a grid electrode of the high-voltage MOS tube module;
the capacitor bank module is used for charging and discharging according to the set frequency by utilizing the capacitive reactance characteristic of the capacitor according to the on-off condition of the high-voltage MOS tube module, and forming an alternating current signal, namely a characteristic current signal for topology identification on a power network.
2. The topology signal transmission circuit based on capacitance switching as claimed in claim 1,
the capacitor bank module comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6, which are respectively connected with a live wire;
the capacitance values of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 determine the signal strength of the characteristic current.
3. The topology signal transmission circuit based on capacitance switching as claimed in claim 2,
the signal intensity calculation formula of the characteristic current is as follows:
I＝K*V/(2*Pi*F*C)
wherein, K is the average value coefficient of the full-bridge rectification, V is the power voltage, F is the power frequency, and C is the capacitance value of the capacitor.
4. The topology signal transmission circuit and the identification method based on capacitance switching as claimed in claim 1,
the capacitor bank module is connected with a lower full-bridge rectification module;
the full-bridge rectification module is used for rectifying current into half-wave high-voltage direct current and comprises a diode VD1, a diode VD2, a diode VD3 and a diode VD 4.
5. The topology signaling circuit based on capacitance switching as recited in claim 4,
the full-bridge rectification module is connected with a driving voltage module for providing stable voltage;
the driving voltage module comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a reverse diode VD5, a diode VD6, a diode VD7 and a diode VD 8.
6. The topology signal transmission circuit based on capacitance switching as claimed in claim 5,
the driving voltage module is connected with a pre-charging module;
the pre-charging module is used for controlling the pre-charging of the capacitor bank module and comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a MOS transistor VT1 and a capacitor C7;
when the capacitor C7 is fully charged, the MOS transistor VT1 is turned off, and the capacitor bank module stops charging, so as to relieve the pressure on the power line.
7. The topology signaling circuit based on capacitance switching according to any of claims 1-6,
the high-voltage MOS tube module is provided with an MOS tube VT2 and is used for receiving PWM signals, so that the capacitor bank module can act on a power network according to the on-off condition of the high-voltage MOS tube module, and special current signals are formed on a power line according to the capacitive reactance characteristic of the capacitor.
8. A topological signal identification method based on capacitance switching is characterized in that,
applying a topology signalling circuit based on capacitive switching according to any of claims 1-7,
which comprises the following steps:
firstly, a capacitor bank module is connected to a live wire through a switch module;
secondly, the PWM modulation waveform of the PWM signal acts on the grid electrode of the high-voltage MOS tube module;
thirdly, the high-voltage MOS tube module controls the capacitor bank module to continuously charge and discharge according to the change rule of the grid voltage of the high-voltage MOS tube module;
fourthly, the charging and discharging signals form an alternating current signal which changes according to a set frequency on the power network and is used as a characteristic current signal for topology identification;
fifthly, transmitting the characteristic current signal to a receiving terminal at the upper stage through a power network, and confirming the subordination relation between the transmitting terminal and the receiving terminal after the receiving terminal recognizes the characteristic current signal;
and sixthly, determining the topological relation of the whole platform area through the subordination relation of each hierarchy.
9. The topology signal identification method based on capacitance switching according to claim 8,
the switching frequency of the PWM signal is f Hz, the switch is turned on for t microseconds and turned off for t microseconds in each switching period, and the duty ratio is 1/2;
coding the characteristic current signal, taking T milliseconds as a code bit, periodically switching on and off the switch for T milliseconds to represent the code bit 1, continuously switching off the switch for T milliseconds to represent the code bit 0, and fixing the code element of the characteristic current signal to be [ 11111001 ];
the topology signal sending circuit generates a corresponding characteristic current signal and sends the characteristic current signal according to the issued time scale; the characteristic current signal is transmitted to a receiving end of the previous stage through a power network, and the receiving end carries out real-time sampling identification on the current signal and stores an identification record; and finally combing the topological structure according to the identification record and by combining a table searching mechanism to obtain the topological relation of the station area.
10. The topology signal identification method based on capacitance switching according to claim 9,
the receiving end utilizes Fourier transform to identify the line current, and the Fourier transform identification formula is shown as follows
Figure FDA0003039713030000031
Figure FDA0003039713030000032
Figure FDA0003039713030000033
wherein ,an,bn,cnRespectively representing frequency points fnThe real part, the imaginary part and the modulus of the harmonic wave, theta is the current phase, T is the number of points adopted in a sliding period, and T0To represent the starting sample point, k represents the sample point number, dt represents the sample time interval,
Figure FDA0003039713030000034
are current samples.
CN202110453491.5A 2021-04-26 2021-04-26 Topology signal transmitting circuit based on capacitor switching and identification method Active CN113328516B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110453491.5A CN113328516B (en) 2021-04-26 2021-04-26 Topology signal transmitting circuit based on capacitor switching and identification method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110453491.5A CN113328516B (en) 2021-04-26 2021-04-26 Topology signal transmitting circuit based on capacitor switching and identification method

Publications (2)

Publication Number Publication Date
CN113328516A true CN113328516A (en) 2021-08-31
CN113328516B CN113328516B (en) 2023-09-22

Family

ID=77413626

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110453491.5A Active CN113328516B (en) 2021-04-26 2021-04-26 Topology signal transmitting circuit based on capacitor switching and identification method

Country Status (1)

Country Link
CN (1) CN113328516B (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060176044A1 (en) * 2005-01-23 2006-08-10 Serconet Ltd. Device, method and system for estimating the termination to a wired transmission-line based on determination of characteristic impedance
US20100033146A1 (en) * 2008-08-07 2010-02-11 Asic Advantage Inc. Current sensing for high voltage buck converter
US20120223583A1 (en) * 2011-03-03 2012-09-06 Massachusetts Institute Of Technology Photovoltaic energy extraction with multilevel output dc-dc switched capacitor converters
CN106229998A (en) * 2016-08-16 2016-12-14 安徽众升电力科技有限公司 A kind of electric power monitoring system
US20180337588A1 (en) * 2017-05-19 2018-11-22 Efficient Power Conversion Corporation Integrated gallium nitride based dc-dc converter
CN109525285A (en) * 2018-11-13 2019-03-26 国网江苏省电力有限公司电力科学研究院 A kind of Power Line Carrier Communication Module with power network topology perceptional function
CN110658386A (en) * 2019-09-10 2020-01-07 国网浙江省电力有限公司电力科学研究院 Capacitance switching-based household variable relation identification method and system
CN111929634A (en) * 2020-09-02 2020-11-13 华立科技股份有限公司 N-line-based signal injection topology recognition device and method
CN111969727A (en) * 2020-08-24 2020-11-20 无锡圣普电力科技有限公司 Novel sending end topology signal self-adaptation system of topology identification system
CN112684302A (en) * 2021-03-11 2021-04-20 国网山东省电力公司青州市供电公司 Low-voltage transformer area attribution relation identification system and method based on LC switching

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060176044A1 (en) * 2005-01-23 2006-08-10 Serconet Ltd. Device, method and system for estimating the termination to a wired transmission-line based on determination of characteristic impedance
US20100033146A1 (en) * 2008-08-07 2010-02-11 Asic Advantage Inc. Current sensing for high voltage buck converter
US20120223583A1 (en) * 2011-03-03 2012-09-06 Massachusetts Institute Of Technology Photovoltaic energy extraction with multilevel output dc-dc switched capacitor converters
CN106229998A (en) * 2016-08-16 2016-12-14 安徽众升电力科技有限公司 A kind of electric power monitoring system
US20180337588A1 (en) * 2017-05-19 2018-11-22 Efficient Power Conversion Corporation Integrated gallium nitride based dc-dc converter
CN109525285A (en) * 2018-11-13 2019-03-26 国网江苏省电力有限公司电力科学研究院 A kind of Power Line Carrier Communication Module with power network topology perceptional function
CN110658386A (en) * 2019-09-10 2020-01-07 国网浙江省电力有限公司电力科学研究院 Capacitance switching-based household variable relation identification method and system
CN111969727A (en) * 2020-08-24 2020-11-20 无锡圣普电力科技有限公司 Novel sending end topology signal self-adaptation system of topology identification system
CN111929634A (en) * 2020-09-02 2020-11-13 华立科技股份有限公司 N-line-based signal injection topology recognition device and method
CN112684302A (en) * 2021-03-11 2021-04-20 国网山东省电力公司青州市供电公司 Low-voltage transformer area attribution relation identification system and method based on LC switching

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
赵凯;孙豪文;: "10kV配电物联网智慧台区关键技术与实践", 电气技术, no. 07 *
陆春光: "基于双芯架构的停上电主动上报电能表设计", 电测与仪表, vol. 58, no. 3 *
马碧燕: "低压台区拓扑辨识方法综述", 现代信息科技, vol. 5, no. 38 *

Also Published As

Publication number Publication date
CN113328516B (en) 2023-09-22

Similar Documents

Publication Publication Date Title
CN202068223U (en) Vehicle-based charging-discharging device based on V2G technology
CN101127491B (en) Ultra-high frequency adjusting harmonic vibration testing power based on high power IGBT
CN111880064A (en) Cable voltage-withstanding partial discharge synchronous detection device
CN108512452A (en) A kind of control system and control method of direct-current grid grid-connection converter electric current
CN105375777A (en) Constant voltage output circuit, flyback switching power supply and electronic device thereof
CN107834360A (en) Portable negative ion generating means and its control method
CN105305577A (en) Active intelligent charging pile not based on communication system, and intelligent charging method therefor
CN111541228B (en) Device and method for modulating electric energy parameters of low-voltage line tail end of power distribution station area
CN112491277A (en) Method for improving efficiency of power electronic transformer through dead time self-adaption
CN106160042A (en) High-efficiency electric automobile charging system
CN109406936A (en) Charging pile alarm and protection module
CN103825337B (en) Based on V2G Constant-current discharge system and control method thereof
CN113328516A (en) Topology signal sending circuit based on capacitance switching and identification method
CN209104848U (en) Charge pile group current distribution system
CN208257661U (en) The controllable high-voltage DC power supply of 35kV oscillatory wave system
CN113572262B (en) Topology sending and identifying method of low-voltage internet of things sensing terminal
CN209296857U (en) Charging pile alarm and protection module
CN208754063U (en) A kind of harmonic energy recycling circuit
CN101378181A (en) Method for reducing local audible noise of extra-high voltage AC line
CN214895724U (en) High-voltage line interphase fault detection system
CN107453613A (en) A kind of solar electric water heater photovoltaic supply convertor and control method
CN115963372A (en) IGBT double-pulse testing device and method for power circuit
CN112904238A (en) High-voltage line interphase fault detection system
CN209104816U (en) Micro-capacitance sensor power supply system
CN209299152U (en) High voltage rectifier stack control system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant